Improvement in oscillating chairs



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OSGILLATING CHAIR.

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ATTORNEYS.

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UNITED STATES PATENT OFFICE.

HENRY GEISE, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN OSCILLATING CHAIRS.

Specification forming part of Letters Patent No. 189,933, dated April24, 1877; application filed January 26, 1877 To all whom it may concernBe it known that I, HENRY GEIsE, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented certain new anduseful Improvements in Chairs; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and useit, reference being had to the accompanying drawings, which form part ofthis specification.

My invention relates to improvements in chairs, more especially in thatclass which tilts or oscillates backward and forward,and consists inproviding the seat bottom with double-rule hinges respectively on eitherside thereof, on. which the chair-seat is pivoted, and in giving thesame a cushioned bearing by interposing between the two parts of eachhinge an elastic block, which latter may be indiarubber or any othermaterial having sufficient resiliency.

The object of such a construction is to give an elastic vertical supportto the chair-seat as the latter is in straight horizontal plane, and atthe same time to furnish a full elastic or cushioned bearing as the seatoscillates upon its pivots. The construction of parts is not onlysimple, but very substantial and really durable under heavy use.

Referring to the drawings, Figure l is a view, in perspective, of achair embodying my invention. Fig. 2 is a front elevation; Fig. 3, avertical section of one of the double hinges detached; Fig. 4., showsthe hinge in detail with its parts disconnected.

A represents the seat-frame, and B the legframe, respectively, of thechair, which, in their construction and general features may be of anydesired form, as any style of chair of this nature may be provided withmy improve ment.

To the transverse middle portion of the lower or under face of each ofthe two side strips 0, forming part of the seat-frame, are secured, byscrews or other fastening means, the castings D, one respectively toeach of the strips. These castings may be of any metal, and preferably Iuse brass. They form the upper half or leaf of the double hinges onwhich the chair is pivoted.

The lower half K of each of the two double hinges, one respectively oneither side of the chair, is similar to the upper half-hinge D justdescribed, so that thetwo correspond in construction and fit together.The lower bearing-plate k is secured by screws or other suitable meansto the upper surface of the supporting-frame B, centrally with itslength.

It has knuckle-pieces L cast on its either side, so as to leave a space,M, in which the lower portion of the elastic block may rest as in asocket; they are formed right angular to their common bearing-plate k,and have circularly beveled or chamfered surfaces N on theirrespectively inner or interior sides.

The elastic block G is interposed between these two halves or leaves ofthe hinge filling the-space formed by the knuckle-pieces cast to eitherlongitudinal side of the same. it is made, preferably, of india-rubber,but any material which will afford a solid body spring to the block maybe used, and thus serve to give vertical cushioned bearing to the upperleaf of the hinge. The two ends, front and rear, are recessed centrallyso as to form a dovetailed groove or transverse recess, 9, at eitherend. These incut grooves prevent the gathering of the elastic stock inthe block, as

the chair-seat oscillates to and fro, which otherwise would prevent thetilting of the upper frame entirely, to any practicable extent.

A pin, J, passes centrally through the rubber block, both holding thelatter in its place, and at the same time engaging the upper and lowerleaves of the double-rule hinge.

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The combination, with a chair-seat and its standard, of double-rulehinges D K, and elastic blocks G, the latter provided with centralopenings, and recessed ends, whereby they are adapted to be centrallysecured between the parts of the hinge, and serve to cushion the forwardand backward movement of the chair-seat, substantially as and for thepurpose set forth.

In testimony that I claim the foregoing I have hereunto set my hand this24th day of January, 1877.

HENRY GEISE. Witnesses:

J OHN URIAN, MAURICE COUGHLAN.

